LTC4259AIGW-1#PBF

Product Summary

The LTC4259AIGW-1#PBF is a Power over Ethernet Controller. The LTC4259AIGW-1#PBF is a quad –48V Hot SwapTM controller designed for use in IEEE 802.3af compliant Power Sourcing Equipment (PSE). It consists of four independent ports, each with output current limit, short-circuit protection, complete Powered Device (PD) detection and classification capability, and programmable PD disconnect using AC or DC sensing. Used with power MOSFETs and passives as in Figure 1, the LTC4259AIGW-1#PBF can implement a complete IEEE 802.3af-compliant PSE. The LTC4259AIGW-1#PBF can operate autonomously or be controlled by an I2C serial interface. Up to LTC4259AIGW-1#PBF -1s may coexist on the same data bus, allowing up to 64 powered Ethernet ports to be controlled with only two digital lines. Fault conditions are optionally signaled with a programmable INT pin to eliminate software polling. The applications of the LTC4259AIGW-1#PBF include IEEE 802.3af Compliant Endpoint and Midspan Power Sources, IP Phone Systems and DTE Power Distribution.

Parametrics

LTC4259AIGW-1#PBF absolute maximum ratings: (1)Supply Voltages VDD to DGND: – 0.3V to 5V; (2)VEE to AGND: 0.3V to –70V; (3)DGND to AGND (Note 2): ±1V; (4)Digital Pins SCL, SDAIN, SDAOUT, INT, AUTO, RESET SHDNn, ADn: DGND – 0.3V to DGND + 5V; (5)Analog Pins GATEn (Note 3): VEE – 0.3V to VEE + 12V; (6)DETECTn Peak Currents (Note 4): ±80mA; (7)SENSEn: VEE – 0.3V to VEE + 1V; (8)OUTn: VEE – 70V to VEE + 70V; (9)OSCIN: DGND – 0.3V to DGND + 5V; (10)BYP Current: ±1mA; (11)Operating Ambient Temperature Range: –40℃ to 85℃; (12)Junction Temperature (Note 5): 150℃; (13)Storage Temperature Range: – 65℃ to 150℃; (14)Lead Temperature (Soldering, 10 sec): 300℃.

Features

LTC4259AIGW-1#PBF features: (1)Controls Four Independent – 48V Powered Ethernet Ports; (2)Operates Autonomously or Controlled by I2CTM Serial Interface; (3)4-Bit Programmable Digital Address Allows Control of Up to 64 Ports; (4)Current and Duty Cycle Limits Protect External FETs; (5)IMPROVED UVLO; (6)Available in a 36-pin SSOP package.

Diagrams